Stars and Batman

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Across
  1. 1. You don't get far on a road trip if this bursts
  2. 5. Batman's city
  3. 6. Summer essential - unless you want to fry
Down
  1. 2. Moon of Jupiter
  2. 3. Pale blue dot
  3. 4. Bruce ___
  4. 7. Time when both stargazers and Batman are most active